Blower defective the xte

I also count among the lucky ones with a defective blower. I drive a diesel Bj 2002 with manual air conditioning. The problem: the blower cannot be switched off, runs constantly on medium level. If I turn on level six it will be a bit faster. That’s it. Sounds like it was, but with me there are different resistances than described. I looked for the said pre-resistance from the different other contributions. With me there is a thick white block. (not the said resistance MJ 802). The other pre-resistance was probably built in with me once by the friendly, as the fan did not at all. Besides the fan is also a golden electronic part. ( 4 contacts – inscription: Omron G4L-1124T / 12 V 20 A / 0661D7). If I solve the plug, the fan is constantly at the highest level and can’t be regulated at all. Question? Could it be that this unknown electronic part regulates the blower and is defective?